ARSN-587: require content md5 in signed headers

[leif-scality]

Require the Content-MD5 to be in the signed headers if present in the request like mentioned in the AWS doc here

[bert-e]

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[bert-e]

Incorrect fix version

The Fix Version/s in issue ARSN-587 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 8.4.5

Please check the Fix Version/s of ARSN-587, or the target
branch of this pull request.

[claude]

LGTM

Review by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.66%. Comparing base (a1fa5b4) to head (b661155).

Additional details and impacted files

@@               Coverage Diff                @@
##           development/8.4    #2633   +/-   ##
================================================
  Coverage            73.65%   73.66%           
================================================
  Files                  223      223           
  Lines                18247    18250    +3     
  Branches              3776     3778    +2     
================================================
+ Hits                 13440    13443    +3     
  Misses                4802     4802           
  Partials                 5        5           

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